Segregation of Species-Specific Male Attractiveness in F₂ Hybrid Lake Malawi Cichlid Fish

Figure 3

Result from the quantitative genetic model. Results from the quantitative genetic model and observations. Mean (±5– 95% CI) expected proportion of F₂ males that are completely homozygous for the reproductive isolation genes (𝑘) of one of the species (solid symbols and line). The open symbols and broken line give the probability of finding the observed number of F₂ males with such genotype as a function of 𝑘. The horizontal dashed line at 𝑦=0.167 shows the observed proportion of males (2 out of 12) that were preferred by females of a single species only, and which are assumed to be homozygous for the reproductive isolation genes. The number of reproductive isolation genes that is most consistent with the model equals 𝑘=2, while 𝑘=1 and 𝑘≥5 are rejected by this model.